/*
 *    LearningCurve.java
 *    Copyright (C) 2007 University of Waikato, Hamilton, New Zealand
 *    @author Richard Kirkby (rkirkby@cs.waikato.ac.nz)
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package moa.evaluation;

import java.util.ArrayList;
import java.util.List;

import moa.AbstractMOAObject;
import moa.core.DoubleVector;
import moa.core.Measurement;
import moa.core.StringUtils;

public class LearningCurve extends AbstractMOAObject {

	private static final long serialVersionUID = 1L;

	protected List<String> measurementNames = new ArrayList<String>();

	protected List<double[]> measurementValues = new ArrayList<double[]>();

	public LearningCurve(String orderingMeasurementName) {
		this.measurementNames.add(orderingMeasurementName);
	}

	public String getOrderingMeasurementName() {
		return this.measurementNames.get(0);
	}

	public void insertEntry(LearningEvaluation learningEvaluation) {
		Measurement[] measurements = learningEvaluation.getMeasurements();
		Measurement orderMeasurement = Measurement.getMeasurementNamed(
				getOrderingMeasurementName(), measurements);
		if (orderMeasurement == null) {
			throw new IllegalArgumentException();
		}
		DoubleVector entryVals = new DoubleVector();
		for (Measurement measurement : measurements) {
			entryVals.setValue(addMeasurementName(measurement.getName()),
					measurement.getValue());
		}
		double orderVal = orderMeasurement.getValue();
		int index = 0;
		while ((index < this.measurementValues.size())
				&& (orderVal > this.measurementValues.get(index)[0])) {
			index++;
		}
		this.measurementValues.add(index, entryVals.getArrayRef());
	}

	public int numEntries() {
		return this.measurementValues.size();
	}

	protected int addMeasurementName(String name) {
		int index = this.measurementNames.indexOf(name);
		if (index < 0) {
			index = this.measurementNames.size();
			this.measurementNames.add(name);
		}
		return index;
	}

	public String headerToString() {
		StringBuilder sb = new StringBuilder();
		boolean first = true;
		for (String name : this.measurementNames) {
			if (!first) {
				sb.append(',');
			} else {
				first = false;
			}
			sb.append(name);
		}
		return sb.toString();
	}

	public String entryToString(int entryIndex) {
		StringBuilder sb = new StringBuilder();
		double[] vals = this.measurementValues.get(entryIndex);
		for (int i = 0; i < this.measurementNames.size(); i++) {
			if (i > 0) {
				sb.append(',');
			}
			if ((i >= vals.length) || Double.isNaN(vals[i])) {
				sb.append('?');
			} else {
				sb.append(Double.toString(vals[i]));
			}
		}
		return sb.toString();
	}

	public void getDescription(StringBuilder sb, int indent) {
		sb.append(headerToString());
		for (int i = 0; i < numEntries(); i++) {
			StringUtils.appendNewlineIndented(sb, indent, entryToString(i));
		}
	}

	public double getMeasurement(int entryIndex, int measurementIndex) {
		return this.measurementValues.get(entryIndex)[measurementIndex];
	}

	public String getMeasurementName(int measurementIndex) {
		return this.measurementNames.get(measurementIndex);
	}

}
